Improvement in casting chilled rolls



anni sont We, GEORGE G. LOBD'ELL and WILLIAM STUART, both ofViilmington, county of Newcastle, State of Delaware, have invented anImprovcmentin Casting Chilled Rolls, of which the following is aspecification.

- Nature and O bjectof the Invention.

Our invention, which is too fnlly'described hereafter to needpreliminary explanation, has for its object the casting of chilled rollshaving soft ends, without inclu'- ring the common danger of the saidends being separated from the chilled body during the cooling andshrinking of the roll.

General Description. Any desired number of hollow cylindrical cast-iron"Grieken" LoDnLL AND WILLIAM STUART, on

f Y nELAWAn-E.

chills of appropriate thickness is fitted and securedI together, asshown in fig 1, so as to form-a tubular mold for the chilled body oftheroll, and on the top` of this mold is a box, a, within which is formedin sand the rising gate b. j j A The lower portion of theLmold is formedin sand contained in a box, d, with which is connected the ver` i ticalbox D, the latter benglso packed with sand as to leave a centralrunning-gate c, which communicates througl1,'a horizontal passage, f,with the interior of t the mold.

The chilled roll E, cast in the mold, has the ordinary tapering ends hand i. A -In casting chilled rolls, it is important that these taperingends should be of comparatively soft metal, for, on finishing the rolls,these ends are first turned x n in a lathe, so as to be converted intothe required l journals, adapted to hearings in whichthe roll revolveswhile ts'ehilled portion is being turned and ground.

Chilled rolls have been heretofore cast in` molds similar to thatdescribed in reference to fig. 1, and, in

- order to insure the softness of the tapering ends,

the latter are cast in contact with sand; thus, thc

lower tapering end i of .the roll iscast in that port-ion ofthe moldformed in sand 'in the box d, while the upper tapering end l1: of therq'll is surrounded by sand m packed in the upper portion of thecylindrical chill A.

,There is however'. in this the ordinary process of casting chilledrolls, a serions defect, which may be explained as follows z` AWILMINGTON,

Letters Patent No. 110,378, dated December 20, 1870.

IMPROVEMENT IN CASTING CHILLED ROLLS:

The Schedule referred to in these Letters HPatent: and making part ofthe vimmo.

After the metal has been poured through the gate c into the mold until-it reaches the rising-gate b, a. snd'den cooling, and acorrespondinglysudden shrinkage of that portion ofthe roll which is incontact with the chill takes placepno evilresnlt ofthis would ensue it'the tapering portion h of the roll followed the contracting chilled bodyot' tllesamc; but it adheres to the sand m, while the latter adheres tothe interior of the chill A; hence, in verymany instances, the taperingend is separated from the body ofthe roll at x,

and the casting is useless.

In order fo obvate this evil, we use a tapering sleeve, G, ot lthinmctalubent to the form ofthe tap-v ering cud l1, of the roll; `this wegenerally coat inside and ont with black-lead, clay, or othernon-conducting v rcti'aetory material, the inner coating preventing themelting of the sleeve, and the outercoat-ing insuring l,the readyseparation ofv the sleeve'from the body of This sleeve is fitted intothe chill at the point shown in lig. 1, and in the 'space between thesleeve and the interior of thechill may be inseltcd the hollow cylinderfm, of baked sand sand when the latter is used.

or loam, which has also been suitably black-washed, alter which the moldis sui-mounted with the box a,

and the rising-gate l1 formed thcreinwith sand.

After the metal has been poured into the mold, the box a is at onceremoved, and whatever metal may have risen into the gate b is separatedfrom the roll at the point y by simply knockingr ite.

Owing to the presence of the metal sleeve G, which prevents the contactof the molten metal with and its adhesion to the body of sand,thetapering end h. will accommodate itself to the shrinkage of thechilled portion of the roll, the sleeve separating from the sand andmoving with the roll when the latter shrinks;

.hence the tapering end remains an integral part of the roll, and is assoft as desirable. y

In some instances theeoated sleeve may be em, ployed alone, as it willprevent the chilling ofthe metal; or the sleeve of baked sand may beemployed alone, if so arranged as to slide inthe mold and to move andremain in Contact with the metal as the'roll shrinks;

in eithercnse the object of my invention is accomplished; that is, lthemold which receives the metal forming' the softend of the cylinder iscarried with the ,latter when it shrinks,'so as to prevent the fractureof the` roll.

To facilitate the descent of the tapering end of the roll as the chilledbody shrinks, we sometimes apply pressure to the end of the newly-eastroll immediately after the removal of the box al yandthe knocking ed themetal on the risingvgate Y lThis pressure may be appliediu a variety'ofways, for inst-ance, a plunger, W, kande' weighted-lever, M,

@titte may be applied, in the manner too clearly illustrated in iig. 4to need euplanation.

The sleeve will be united or partially united to the metal of the roll,but can be readily removed by ti-.ir-

ing or chipping it olf, or removing it in the lathe when the journal isturned.

Claims. 1. The employment, in casting chilled rolls, of :t sleeve, orits equivalent, receiving the metalwhieh forms the soft, end of theroll, and moving with the latter when the meta-1 contracts,substantially as de- Scribe-(l.

2. 'lhe application, to the top of the newly-enst roll,

'nl' pressure, as set forth.

ln testimony whereof we have signed our names to this speeiliczitioniuthe presence of two subscribing witnesses.

GEORGE G. LOBDELL. Witnesses: XVILLIAM STUART.v

JARRE'TT MEGA-w, JAMES H. CAMERON.

